So I have been on the new beta since it came out a couple days ago. Today accidentally I stumbled onto the best new added feature for 6.1. So it effects us that have Music Match and have cars with integrated iPod USB jacks. So when I use to plug in my iPhone it would lock out Music so I could only control it with my head unit of my car in dock connector mode. This would make it not possible to stream from the cloud using match because my head unit would not see those songs as a part of the available catalogue. Now it has unlocked this so using my iPhone I can go into my Match song database and play it on my car's stereo system. Genius playlists and all. This makes it possible for me now to not have to use like slacker radio or pandora to get a wide variety of songs nor have to sync all my songs to my phone's memory. This is indeed sweet and hopefully they will not lock this up for the general release. Thanks Apple for finally listening to our needs once. I have been waiting for this since I got an iPhone 4s